package com.qsl.netty.codec;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

/***
 * @description netty client handler
 * @author 青石路
 * @date 2022/2/14 23:09
 */
public class NettyClientHandler extends ChannelInboundHandlerAdapter {

    /**
     * 当通道就绪会触发该方法
     * @param ctx
     * @throws Exception
     */
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("client ctx = " + ctx);
        ctx.writeAndFlush(Unpooled.copiedBuffer("hello, 服务端~", CharsetUtil.UTF_8));
    }

    /**
     * 当通道有读取事件时触发
     * @param ctx
     * @param msg
     * @throws Exception
     */
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

        ByteBuf buf = (ByteBuf) msg;
        System.out.println("服务器回复的消息：" + buf.toString(CharsetUtil.UTF_8));
        System.out.println("服务器的地址：" + ctx.channel().remoteAddress());
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        ctx.close();
    }
}
